This is the key to finding the meaning of “Peace on Earth” – Genesis 12:3
 Now the LORD said unto Abram: ‘Get thee out of thy country, and from thy kindred, and from thy father’s house, unto the land that I will show thee.
 And I will make of thee a great nation, and I will bless thee, and make thy name great; and be thou a blessing.
 And I will bless them that bless thee, and him that curseth thee will I curse; and in thee shall all the families of the earth be blessed.’
Hebrew – English Bible / Mechon-Mamre
God calls Abraham to be a blessing to “all the families of the earth” and shapes the future of his family by numerous promises. God determined to call out a special people for Himself through whom He would bring blessing to all the nations. The Abrahamic Covenant as described in Genesis 12:1–3 and is an unconditional covenant. It is also a literal covenant in which the promises should be understood literally. The land that is promised should be understood in its literal or normal interpretation. It is also an everlasting covenant. The promises that God made to Israel are eternal.
Genesis 12:1-3 further provides a link to what precedes (“all the families of the earth”) and what follows (especially the promises) through the wisdom within the Torah. God is the speaker throughout and is the subject of the promises given. The promises focus on nationhood (which implies descendants), renown, and blessing for Abraham’s family and for others through them.
Genesis 12:1-3 therefore provides the key for all nations of the world which is the wisdom of Hebrew Bible [Torah]. God gave the responsibility of the revelation of the Torah to Israel, the 12 tribes, the children of Israel and their descendants, which is an eternal covenant. God Blesses those who Bless the Torah and Curses those who curse the Torah. By the same token, not one word or one letter can be altered in the Torah. Therefore when we bless the children of Israel we are blessed and when we curse the children of Israel we are cursed, individually or as a nation.
The final phrase (“all the families of the earth”) presents the ultimate objective of all the prior divine promises, namely, blessing for all the families of the earth. This family will be God’s primary agent in and through which God’s cosmic purposes are to be realized. God’s election of Abraham is thus said to serve the mission of the Torah.
Through the Divine master plan of the external universe and by our observance of the Laws of the Universe we integrate the outer universe with the personal universe that is inside us. Thus human beings, by elevating their souls to unite with the Divine realm also elevate all other entities in the cosmos. That is the essence of spiritual enlightenment.
This is the key to finding the meaning of “Peace on Earth” – Genesis 12:3. May you all be blessed!